Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters

This study proposes a quasi-fixed-frequency hysteresis current tracking control strategy for modular multilevel converters(MMCs) on the basis of voltage partition principle. First, by monitoring the grid voltage and the deviation between the outputand reference currents, the output voltage is determined, thus prompting the output current to quickly and efficiently track thegiven current. Second, the voltages of the upper/lower capacitor of the arm and the voltages between the upper and lower armsare balanced by combining these arms with virtual loop mapping and arm voltage balance control, respectively. In particular, theproposed method is designed for any level and number of sub-modules. The validity of the proposed method is verified bysimulations and experimental results of a five-level MMC prototype.

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Cite this article

[IEEE Style]

J. Mei, Y. Ji, X. Du, T. Ma, C. Huang, Q. Hu, "Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters," Journal of Power Electronics, vol. 14, no. 6, pp. 1147-1156, 2014. DOI: 10.6113/JPE.2014.14.6.1147.

[ACM Style]

Jun Mei, Yu Ji, Xiaozhou Du, Tian Ma, Can Huang, and Qinran Hu. 2014. Quasi-Fixed-Frequency Hysteresis Current Tracking Control Strategy for Modular Multilevel Converters. Journal of Power Electronics, 14, 6, (2014), 1147-1156. DOI: 10.6113/JPE.2014.14.6.1147.